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    VLA Observations of the Disk around the Young Brown Dwarf 2MASS J044427+2512

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    Ricci_2017_ApJ_846_19.pdf
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    Author
    Ricci, L.
    Rome, H.
    Pinilla, P. cc
    Facchini, Stefano cc
    Birnstiel, T. cc
    Testi, L. cc
    Affiliation
    Univ Arizona, Dept Astron, Steward Observ
    Issue Date
    2017-08-25
    Keywords
    brown dwarfs
    circumstellar matter
    planets and satellites: formation
    protoplanetary disks
    stars: individual (2M0444)
    
    Metadata
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    Publisher
    IOP PUBLISHING LTD
    Citation
    VLA Observations of the Disk around the Young Brown Dwarf 2MASS J044427+2512 2017, 846 (1):19 The Astrophysical Journal
    Journal
    The Astrophysical Journal
    Rights
    © 2017. The American Astronomical Society. All rights reserved.
    Collection Information
    This item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at repository@u.library.arizona.edu.
    Abstract
    We present multi-wavelength radio observations obtained with the VLA of the protoplanetary disk surrounding the young brown dwarf 2MASS J04442713+2512164 (2M0444) in the Taurus star-forming region. 2M0444 is the brightest known brown dwarf disk at millimeter wavelengths, making this an ideal target to probe radio emission from a young brown dwarf. Thermal emission from dust in the disk is detected at 6.8 and 9.1 mm, whereas the 1.36 cm measured flux is dominated by ionized gas emission. We combine these data with previous observations at shorter sub-mm and mm wavelengths to test the predictions of dust evolution models in gas-rich disks after adapting their parameters to the case of 2M0444. These models show that the radial drift mechanism affecting solids in a gaseous environment has to be either completely made inefficient, or significantly slowed down by very strong gas pressure bumps in order to explain the presence of mm/cm-sized grains in the outer regions of the 2M0444 disk. We also discuss the possible mechanisms for the origin of the ionized gas emission detected at 1.36 cm. The inferred radio luminosity for this emission is in line with the relation between radio and bolometric luminosity valid for for more massive and luminous young stellar objects, and extrapolated down to the very low luminosity of the 2M0444 brown dwarf.
    ISSN
    1538-4357
    DOI
    10.3847/1538-4357/aa81bf
    Version
    Final published version
    Sponsors
    European Research Council (ERC) under the European Union's Horizon research and innovation programme [714769]
    Additional Links
    http://stacks.iop.org/0004-637X/846/i=1/a=19?key=crossref.4276cf8d882c700ef4c062936739350f
    ae974a485f413a2113503eed53cd6c53
    10.3847/1538-4357/aa81bf
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    UA Faculty Publications

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